Final answer:
Halophytic plants are adapted to survive in high salinity environments, making coastal ecosystems the correct answer. These plants have special adaptations to manage salt intake and are typically found in estuaries and along coasts.
Step-by-step explanation:
The ecosystems that are dominated by halophytic plants are typically those with high salinity levels such as coastal regions. Halophytes are plants adapted to grow in salty conditions, often found in estuaries where freshwater mixes with salt water. Therefore, among the options provided, the correct answer is:
Halophytic plants have various adaptations like filters in their roots to remove salt from the water they absorb or mechanisms to pump oxygen into their roots. These adaptations allow them to survive in environments like estuaries and coastal ecosystems where salt from sea spray and tidal changes pose physiological challenges to plant life.